WARNING: DO NOT UPGRADE IF YOU HAVE A JAILBROKEN OR UNLOCKED DEVICE. THERE ARE CURRENTLY NO TOOLS AVAILABLE FOR iOS 4.3.4 and 4.3.5.

Ten days ago Apple released iOS 4.3.4, in order to address JailbreakMe.com's PDF Exploit. Today Apple has just released iOS 4.3.5 in order to address a security issue with certificate validation.

Fixes a security vulnerability with certificate validation.
The new version checks in as Build 8L1, and is for the GSM iPhone 4, iPhone 3GS, all iPads, and the third- and-fourth-generation iPod touch. A separate iOS 4.2.10 (Build 8E600) is available for the CDMA iPhone.

The servers seem pretty busy for some reason (hope you guys aren't updating), but if your really into it, the update is indeed available.